#     Copyright 2020, Kay Hayen, mailto:kay.hayen@gmail.com
#
#     Part of "Nuitka", an optimizing Python compiler that is compatible and
#     integrates with CPython, but also works on its own.
#
#     Licensed under the Apache License, Version 2.0 (the "License");
#     you may not use this file except in compliance with the License.
#     You may obtain a copy of the License at
#
#        http://www.apache.org/licenses/LICENSE-2.0
#
#     Unless required by applicable law or agreed to in writing, software
#     distributed under the License is distributed on an "AS IS" BASIS,
#     WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
#     See the License for the specific language governing permissions and
#     limitations under the License.
#
""" Demotion of compiled modules to bytecode modules.

"""

import marshal
from logging import info

from nuitka import Options
from nuitka.importing.ImportCache import (
    isImportedModuleByName,
    replaceImportedModule,
)
from nuitka.ModuleRegistry import replaceRootModule
from nuitka.nodes.ModuleNodes import makeUncompiledPythonModule
from nuitka.plugins.Plugins import Plugins


def demoteCompiledModuleToBytecode(module):
    """ Demote a compiled module to uncompiled (bytecode).

    """

    full_name = module.getFullName()
    filename = module.getCompileTimeFilename()

    if Options.isShowProgress():
        info("Demoting module '%s' to bytecode from '%s'." % (full_name, filename))

    source_code = module.getSourceCode()

    # Second chance for plugins to modify source code just before turning it
    # to bytecode.
    source_code = Plugins.onFrozenModuleSourceCode(
        module_name=full_name, is_package=False, source_code=source_code
    )

    bytecode = compile(source_code, filename, "exec", dont_inherit=True)

    bytecode = Plugins.onFrozenModuleBytecode(
        module_name=full_name, is_package=False, bytecode=bytecode
    )

    uncompiled_module = makeUncompiledPythonModule(
        module_name=full_name,
        filename=filename,
        bytecode=marshal.dumps(bytecode),
        is_package=module.isCompiledPythonPackage(),
        user_provided=True,
        technical=False,
    )

    uncompiled_module.setUsedModules(module.getUsedModules())
    module.finalize()

    if isImportedModuleByName(full_name):
        replaceImportedModule(old=module, new=uncompiled_module)
    replaceRootModule(old=module, new=uncompiled_module)

    from nuitka.plugins.PluginBase import isTriggerModule, replaceTriggerModule

    if isTriggerModule(module):
        replaceTriggerModule(old=module, new=uncompiled_module)
